During the day, Xavier Van der Stappen runs an electric car company. At night, the Belgian entrepreneur/designer helps spearhead the ORIG-AMI project, which creates origami-style cardboard tents designed to shield Brussels’ homeless from the bitter cold of winter. Cardboard is light and portable. It holds heat fairly well. And the cardboard tents (as opposed to other structures) are legal on Brussels’ streets. The cost for each life-saving structure? Only $36.

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